Investors were pleased with this, especially as the company blew past expectations for Q4 international subscriber growth by adding 4.04 million in the final three months of 2015.

However, there is one obstacle to Netflix's global domination in the near future: many people in the world still can't afford the high-speed broadband one needs to actually use Netflix.

As a Deutsche Bank analyst team lead by Stuart Kirk explained:

If the smallest FANG, Netflix, really can operate in every country except China, then perhaps a valuation of 365 times the earnings it announced this week is not so ludicrous. But consider the implied subscriber growth. To fall in line with the market's 15 times earnings multiple, Netflix requires an extra $2.9bn of income. At its ten-year average margin of six per cent that equates to $50bn of revenue. If average pricing remains at $7.50 per month, and the world's ex-China population of 5.7bn live four to a house, Netflix must sign up two-fifths of the world's homes. Rising subscription prices will lower that proportion but the challenge remains titanic given high-speed broadband remains a luxury for many. Indeed, only 1.5% of Indonesian households have it. To remain a FANG, Netflix may have to find new income streams.

Notably, a large percentage of those living in non-US, non-European countries actually do not have internet access at all. Only 35% of individuals in developing markets have Internet access and only 10% of people in the world's least developed countries have Internet access, according to the International Telecommunications Union.

Broken down by region, 47.3% of people in Arab states, 36.9% in Asia & Pacific, and 20.7% of households in Africa have internet access, according to the ITU.

The numbers are similar for mobile internet: 40.6% of residents in Arab states, 42.3% in Asia & Pacific, and 17.4% in Africa have mobile broadband subscriptions. And affordability seems to play a part in this, too.

In a report on internet usage, the Internet Society noted that: "In South America, Africa, the Middle East and Asia-Pacific, there are many examples of countries in which an Internet access subscription makes up over 10% of the average GDP per capita. These countries are often those in which both service costs are relatively high and GDP per capita levels are relatively low."

"The cost, or more precisely affordability, of Internet access has a significant impact on the uptake of services," they added.
Broadband access and affordability is a big challenge. Important note: This data is from 2011.Wikimedia

To add one more interesting long-term look at all of this, it's notable that many of the regions with the lowest internet/mobile broadband penetration also happen to be the regions with the youngest/fast growing populations.

Regarding international markets, Netflix wrote in its letter to shareholders they "are starting by primarily targeting outward‐looking, affluent consumers with international credit cards and smartphones."

"Our growth in these new markets will unfold over many years as we improve our service ... As with every market we've launched, our approach is to listen, learn and improve rapidly, adding more content," the company added.

In any case, it appears to be a smart idea for Netflix to pursue markets abroad, it just may take some time to get many people on board.